At the initial moment the activity of a certain radionuclie totalled `650` particles per minute. What will be the activity of the preperation after half its half-life period?

At the initial moment the activity of a certain radionuclie totalled `

1.	At the initial moment the activity of a certain radionuclie totalled `650` particles per minute. What will be the activity of the preperation after half its half-life period?
Answer» The activity is proprotional to the number to the number of parent nuclei(assuming that the daughter is not radioactive). In half its half-life period, the number of parent nucli decrease by a factor `(2)^(-1//2)=(1)/(sqrt(2))` So activity decreases to `(650)/(sqrt(2))= 460` particles per minute.

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At the initial moment the activity of a certain radionuclie totalled `650` particles per minute. What will be the activity of the preperation after half its half-life period?

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